Question

在Spring Data JPA中，当我将@NamedQueries与lockMode = LockModeType.WRITE一起使用时，我可以在日志中看到结果（假设jpa.show-sql为true）：

... SELECT ... FOR UPDATE

但是，当我在方法上使用@Lock(LockModeType.WRITE)注释时，在日志中什么也看不到。我要确保锁定机制按预期工作。

如何查看@Lock(LockModeType.WRITE)正常工作？应该启用什么日志级别？

编辑：这是我的代码的摘录：

@Service
public class UserService {
    private final UserRepository userRepository;

    @Autowired
    public UserService(UserRepository userRepository) {
        this.userRepository = userRepository;
    }

    @Lock(LockModeType.PESSIMISTIC_WRITE)
    @Transactional
    public User checkCredentials(String email, String password, String verificationCode)
            throws BadCredentialsException {

        User user = userRepository.findByEmail(email);
        if(user == null)
            throw new BadCredentialsException("Invalid username");

        ...

        user.setLastVerificationCode(verificationCode);
        userRepository.save(user);

        return user;
    }
}

Answer 1

您使用了错误的CREATE FUNCTION GetPath(startingID INT) @outputVal VARCHAR(20) OUTPUT BEGIN DECLARE x INT; SELECT category_id INTO x FROM table2 Where product_id = startingID; SET outputVal = x; sloop:LOOP SELECT category_id INTO x FROM table1 WHERE parent_id = x; IF x IS NOT NULL THEN SET outputVal = outputVal + "," + x; ITERATE sloop; ELSE LEAVE sloop; END IF; END LOOP; RETURN outputVal; END $$：LockModeType是LockModeType.WRITE的同义词

LockModeType.OPTIMISTIC_FORCE_IMCREMENT

并且您可以从 service 方法中删除@Lock(LockModeType.PESSIMISTIC_WRITE)，因为@Lock仅适用于存储库方法。将@Lock添加到相应的 service 方法也很重要。

在此处详细了解@Transactional

https://docs.oracle.com/javaee/7/api/javax/persistence/LockModeType.html

在Spring Data JPA中调试@Lock

1 个答案: